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Measurement and modelling of the Japanese koto: Problems and solutions

机译：日本koto的测量与建模：问题与解决方案

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There are few studies of the acoustical properties of the Japanese koto (zither) resonances. As part of the measurement of a hand-crafted professional-grade koto as the basis of the construction of a high-resolution finite element model using COMSOL Multiphysics software, three major problems had to be resolved and are discussed. First, issues relating to measuring the complex geometry were only resolved by obtaining 2300 cross-sections of the koto in a high-resolution computer tomography scan. These revealed hitherto unseen details such as the roughhewn interior. These were then used to create a finite element mesh for modelling with up to 34 million degrees of freedom. This significantly improved the accuracy of the modelling. Second, lack of information on the paulownia wood for key model inputs required scientific evaluations of physical properties by microscopy and independent testing. Model accuracy was further improved when this data was combined with knowledge of the traditional Japanese grade system relating to grain structures used in different instrumental components. Third, identifying the peaks from the results of modelling also proved to be an ongoing problem that required a number of solutions. Results of the modelling of the acoustic characteristics of the koto are also briefly reported.
机译：少数关于日本科托托（Zont）共振的声学特性的研究。作为使用COMSOL Multiphysics软件的高分辨率有限元模型建造的手工制作专业级Koto的一部分，必须解决三个主要问题并讨论。首先，仅通过在高分辨率计算机断层扫描扫描中获取2300个Koto横截面来解决与测量复杂几何有关的问题。这些迄今为止迄今看不见的细节，如粗糙的内饰。然后用于创建有限元网，用于建模，具有高达3400万自由度的建模。这显着提高了建模的准确性。其次，缺乏关于泡桐木材的信息，用于关键模型投入需要通过显微镜和独立测试来进行物理性质的科学评估。当该数据与不同仪器组件中使用的晶粒结构相关的传统日本级系统相结合时，模型精度进一步提高。第三，识别建模结果的峰值也被证明是需要许多解决方案的持续问题。还简要介绍了koto的声学特性建模的结果。

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